chore: rework plugin readmes, json changelogs and standalone repo setup

plugins/automations/CONTRIBUTING.md

@@ -0,0 +1,19 @@
+# Contributing to Automations
+
+## Development
+
+```bash
+npm run build      # build into dist/
+npm run test       # run this plugin's tests
+npm run typecheck  # type-check this plugin
+npm run validate   # check manifest.json
+npm run format     # format the code with Prettier
+```
+
+## Permissions
+
+- `automations.view`: see automations and their runs. Admins and users have it by default.
+- `automations.create`: create automations. Admins and users have it by default.
+- `automations.edit`: change automations. Admins and users have it by default.
+- `automations.delete`: delete automations. Admins and users have it by default.
+- `automations.run`: run automations by hand. Admins and users have it by default.